Electricity: circuit makers and breakers – Limit switch
Patent
1990-03-27
1991-07-02
Recla, Henry J.
Electricity: circuit makers and breakers
Limit switch
20033200, H01H 316, H01H 320
Patent
active
050287486
ABSTRACT:
A limit switch comprising a case housing a switching unit, a head secured to one end of the case, a rotary shaft rotatably supported by the head and having a flat portion, a manipulation lever secured at a butt end thereof to the rotary shaft which supports at a tip end thereof roller means for detecting an object, a return coil spring provided in the head which applies a force through a return plunger to the flat portion of the rotary shaft to return the manipulation lever to a free position, a disk cam secured to the rotary shaft and having a projection formed on a peripheral portion thereof in a position corresponding to the free position of the manipulation lever, manipulation plunger means for the switching unit which is driven in response to rotary movement of disk cam and elastic stopper means disposed in the head for contacting the projection of disk cam and for braking the manipulation lever when manipulation lever is returned to the free position, whereby the lever is prevented from being swung back beyond the free position. Therefore, the switching unit is prevented from chattering.
REFERENCES:
patent: 4847453 (1989-07-01), Newell et al.
Omron Corporation
Recla Henry J.
Walczak David J.
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